The Secret Service has launched an investigation into an unidentified white powder that Venessa Tump, the wife of Donald Trump Jr., came into contact with while opening a piece of mail.

Venessa Trumpand two other people who may have been exposed were taken to a New York hospital, where they later learned the substance was non-hazardous, Reuters reports.

“The substance had arrived by mail and it was addressed to Donald Trump Jr.,” said New York Police Department spokesman Carlos Nieves.

The Secret Service and other agencies have taken white powder seriously since 2001, when anthrax-laced envelopes were sent to media outlets and U.S. lawmakers, killing five people.

Most cases since then have been hoaxes.

Authorities said the packages had a Boston postmark, but law enforcement officials have declined to discuss it.

“Thankful that Vanessa & my children are safe and unharmed after the incredibly scary situation that occurred this morning,” Trump Jr. said on Twitter. “Truly disgusting that certain individuals choose to express their opposing views with such disturbing behavior.”

A book by Gary J. Byrne, a former Secret Service officer in the uniform division, claims President Bill Clinton often snuck away from his wife at the White House to cozy up with “well-known and lesser-known mistresses,” and that a Secret Service officer in the motorcade was nearly killed in a crash during one secret escape, writes Paul Bedard of the Washington Examiner.

Alex Jones, the poster-boy for right-wing conspiracies and paranoia, said he’s helping the Secret Service track down people whom he alleges are plotting to assassinate President Trump.

“I had the Secret Service call me yesterday, and it wasn’t a secret meeting, but they want to come here and — it’s total twilight zone — and want me to brief them on all the data we’ve collated on whose setting up a plan to kill the president,” he claimed during a broadcast of “The Alex Jones Show” on Wednesday.

The Secret Service told the Washington Times that it’s “aware of Mr. Jones’ statements, but as a matter of practice we do not comment on protective intelligence matters.”

The ardent Trump supporter and conspiracy theorist added on his show: “I’m going to develop that plan; and video clips, articles, all of it. And I’m also going to present the plan here. Secret Service didn’t care if I kept it secret. They said that’s fine.”

A former Secret Service agent received an additional two years in prison for stealing bitcoins during an investigation into drug marketplace Silk Road.

Shaun Bridges, 35, was sentenced in 2015 to nearly six years in prison stealing more than $800,000 worth of bitcoins during the Silk Road probe.

Bridges pleaded guilty in August to money laundering in another criminal case involving the theft of more than $350,000 with of bitcoin that today is worth more than $800,000. On Tuesday, U.S. District Court Judge Richard Seeborg in San Francisco sentenced Bridges to another two years in prison, the Justice Department announced.

The investigation shut down Silk Road in October 2013, and authorities said the site generated more than $214 million in sales of drugs and other illicit goods and services, relying on bitcoins for payment.